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Highly Transparent and Adhesive Poly(vinylidene difluoride)Films for Self-Powered Piezoelectric Touch Sensors

Chinese Journal of Polymer Science 2022年第7期40卷 726-737页

作者： qing-qing Li Guang-Kuo Wang Zi-Xu Liang zhi-jun Hu School of Optoelectronic Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow UniversitySuzhou215006China Center for Soft Condensed Matter Physics and Interdisciplinary Research Soochow UniversitySuzhou215006China Soochow University Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of ChinaSuzhou215006China

With the rapid development of internet of things,self-powered touch sensors made of piezoelectric fluorinated polymers have attracted significant interest because they can constantly convert mechanical energy into electrical energy without external power supply.However,it is still challenging to fabricate fluorinated polymer films with good adhesion and high output performance with a large-scale and low-cost method while maintaining high transparency,which are extremely important for simultaneous optical detection and electromechanical transduction.In this work,we demonstrate that the incorporation of a molecular ferroelectric-dabcoHReO_(4)(DH)into poly(vinylidene difluoride)(PVDF)solution enables high-throughput and low-temperature processing of flexible and transparent piezoelectric films by scalable processing method.The effects of multiaxial DH are multiple.First,DH can trigger the phase transition of PVDF fromα-toβ-phase and realize the orderly orientation of PVDF,which guarantees higher piezoelectric performance without any additional electrical poling process.Second,the hydrophilic nature of DH can improve the adhesion properties of PVDF,which in turn improve the stability and durability of the devices.By optimizing the fabrication processes,the transmittance of the piezoelectric touch sensors based on PVDF films and Ag nanowires coated poly(ethylene terephthalate)electrodes can be higher than 94%.The piezoelectric voltage constant g;of the transparent films can reach to 1.2 V·m·N;,which is at least three times higher than the commercially available PVDF films obtained by stretching.These results indicate that the flexible piezoelectric sensors have potential applications in transparent electronic devices for mechanical sensing and energy harvesting.

关键词： PVDF Transparent Adhesive Large scale Piezoelectric sensor

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mRNA cancer vaccines:Advances,trends and challenges

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Acta Pharmaceutica Sinica B 2022年第7期12卷 2969-2989页

作者： qing He Hua Gao Dejiang Tan Heng Zhang jun-zhi Wang National Institutes for Food and Drug Control State Key Laboratory for Evaluation and Standardization of Innovative Vaccines and Biotechnology ProductsBeijing 102629China

Patients exhibit good tolerance to messenger ribonucleic acid(m RNA)vaccines,and the choice of encoded molecules is flexible and diverse.These vaccines can be engineered to express full-length antigens containing multiple epitopes without major histocompatibility complex(MHC)restriction,are relatively easy to control and can be rapidly mass produced.In 2021,the U.S.Food and Drug Administration(FDA)approved the first m RNA-based coronavirus disease 2019(COVID-19)vaccine produced by Pfizer and Bio NTech,which has generated enthusiasm for m RNA vaccine research and development.Based on the above characteristics and the development of m RNA vaccines,m RNA cancer vaccines have become a research hotspot and have undergone rapid development,especially in the last five years.This review analyzes the advances in m RNA cancer vaccines from various perspectives,including the selection and expression of antigens/targets,the application of vectors and adjuvants,different administration routes,and preclinical evaluation,to reflect the trends and challenges associated with these vaccines.

关键词： mRNA Cancer vaccine Tumor-associated antigens Neoantigens mRNA delivery vectors Adjuvants Administration routes

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A new species of the gudgeon genus Microphysogobio Mori,1934(Cypriniformes:Cyprinidae)from Zhejiang Province,China

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Zoological Research 2022年第4期43卷 356-361页

作者： zhi-Xian Sun Bin-qing Zhu jun Wu Ya-Hui Zhao Key Laboratory of Zoological Systematics and Evolution Institute of ZoologyChinese Academy of SciencesBeijing100101China Nanjing Institute of Environmental Sciences Ministry of Ecology and Environment of ChinaNanjingJiangsu 210042China

DEAR EDITOR,A new gobionine species,Microphysogobio oujiangensis sp.nov.,was collected from the Oujiang River Basin during field work in Lishui City,Zhejiang Province in 2021.The new species can be well distinguished from its congeners by the combination of the following characteristics:mouth shallow arc-shaped,width of cutting edge on upper jaw equal to half mouth width,central portion of anterior papillae arranged in one row with 6-10 well-developed papillae of equal size.

关键词： shallow shaped Zhejiang

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Application value of biofluid-based biomarkers for the diagnosis and treatment of spinal cord injury

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Neural Regeneration Research 2022年第5期17卷 963-971页

作者： Hong-Da Wang zhi-Jian Wei jun-Jin Li Shi-qing Feng Department of Orthopedics Tianjin Medical University General HospitalTianjinChina International Science and Technology Cooperation Base of Spinal Cord Injury Tianjin Key Laboratory of Spine and Spinal CordTianjin Medical University General HospitalTianjinChina Department of Orthopedics Qilu HospitalCheeloo College of MedicineShandong UniversityJinanShandong ProvinceChina Shandong University Center for Orthopedics Cheeloo College of MedicineShandong UniversityJinanShandong ProvinceChina

Recent studies in patients with spinal cord injuries(SCIs)have confirmed the diagnostic potential of biofluid-based biomarkers,as a topic of increasing interest in relation to SCI diagnosis and treatment.This paper reviews the research progress and application prospects of recently identified SCI-related biomarkers.Many structural proteins,such as glial fibrillary acidic protein,S100-β,ubiquitin carboxy-terminal hydrolase-L1,neurofilament light,and tau protein were correlated with the diagnosis,American Spinal Injury Association Impairment Scale,and prognosis of SCI to different degrees.Inflammatory factors,including interleukin-6,interleukin-8,and tumor necrosis factorα,are also good biomarkers for the diagnosis of acute and chronic SCI,while non-coding RNAs(micro RNAs and long non-coding RNAs)also show diagnostic potential for SCI.Trace elements(Mg,Se,Cu,Zn)have been shown to be related to motor recovery and can predict motor function after SCI,while humoral markers can reflect the pathophysiological changes after SCI.These factors have the advantages of low cost,convenient sampling,and ease of dynamic tracking,but are also associated with disadvantages,including diverse influencing factors and complex level changes.Although various proteins have been verified as potential biomarkers for SCI,more convincing evidence from large clinical and prospective studies is thus required to identify the most valuable diagnostic and prognostic biomarkers for SCI.

关键词： biomarker diagnosis inflammatory cytokine motor recovery non-coding RNA prognosis spinal cord injury structural protein trace element

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Study on the Nonlinear Tension-Torsion Coupled Stiffness of the High-Current Composite Umbilical Considering the Thermal Effect

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China Ocean Engineering 2022年第4期36卷 588-600页

作者： YAN jun SU Qi BU Yu-feng LU qing-zhen YANG zhi-xun State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsDalian University of TechnologyDalian 116024China Ningbo Institube of Dalian University of Technology Ningbo 315040China State Key Laboratory of Structural Analysis for Industrial Equipment School of Ocean Science and TechnologyDalian University of TechnologyPanjin 124221China Institute of marine machinery College of Mechanical and ElectricalEngineering Harbin Engineering UniversityHarbin 150001China

The gradual advances of offshore oil and gas exploitation and the development tendency of equipment integration have prompted the design of a new type of the high-current composite umbilical to meet development needs.In order to study the mechanical behavior of the high-current composite umbilical(HCCU)and provide design suggestions,a theoretical analysis framework of the tension-torsion coupled behavior of the spirally wound structure is proposed,which focuses more on the radial mechanical behavior.Then,by considering the mechanical and thermal conditions during the operation of HCCU,a semi-analytical method of the tension and torsion stiffness of the high-current composite umbilical considering the temperature effect is established.Furthermore,a practical case of HCCU is given,and the thermal effect on the radial and axial mechanical behaviors are analyzed.It is found that the thermal effect has a significant influence on the radial stiffness,and shows non-linear variation characteristics.Finally,the sensitivity analysis is carried out to study the influence of the design parameter on the stiffness of tension and torsion.The results indicated that the equivalent radial stiffness and helical angle have obvious effect on the tension-torsion coupled stiffness,which can provide reasonable reference for the design of HCCU.

关键词： high-current composite umbilical tension-torsion coupled thermo-mechanical coupled radial stiffness

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Hydrogen-rich water ameliorates neuropathological impairments in a mouse model of Alzheimer's disease through reducing neuroinflammation and modulating intestinal microbiota

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Neural Regeneration Research 2022年第2期17卷 409-417页

作者： Yi-Tong Lin qing-qing Shi Lei Zhang Cai-Ping Yue zhi-jun He Xue-Xia Li Qian-jun He Qiong Liu Xiu-Bo Du College of Life Sciences and Oceanography Guangdong Provincial Key Laboratory for Plant EpigeneticsShenzhen UniversityShenzhenGuangdong ProvinceChina Guangdong Provincial Key Laboratory of Biomedical Measurements and Ultrasound Imaging National-Regional Key Technology Engineering Laboratory for Medical UltrasoundSchool of Biomedical EngineeringHealth Science CenterShenzhen UniversityShenzhenGuangdong ProvinceChina Shenzhen Bay Laboratory ShenzhenGuangdong ProvinceChina

Hydrogen exhibits the potential to treat Alzheimer's disease. Stereotactic injection has been previously used as an invasive method of administering active hydrogen, but this method has limitations in clinical practice. In this study, triple transgenic(3×Tg) Alzheimer's disease mice were treated with hydrogen-rich water for 7 months. The results showed that hydrogen-rich water prevented synaptic loss and neuronal death, inhibited senile plaques, and reduced hyperphosphorylated tau and neurofibrillary tangles in 3×Tg Alzheimer's disease mice. In addition, hydrogen-rich water improved brain energy metabolism disorders and intestinal flora imbalances and reduced inflammatory reactions. These findings suggest that hydrogen-rich water is an effective hydrogen donor that can treat Alzheimer's disease. This study was approved by the Animal Ethics and Welfare Committee of Shenzhen University, China(approval No. AEWC-20140615-002) on june 15, 2014.

关键词： Alzheimer's disease amyloid-β anti-inflammation bioenergetics gut microbiota hydrogen therapy neurodegenerative disease neurofibrillary tangles

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Shock Index,Modified Shock Index,and Age-Adjusted Shock Index in Predicting the In-Hospital Mortality in Patients with Heart Failure and Chronic Kidney Disease

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Biomedical and Environmental Sciences 2023年第3期36卷 279-283页

作者： HAN Su WANG Chuan He TONG Fei LI Ying LI zhi Chao SUN Zhao qing SUN zhi jun Cardiovascular Medicine Department Shengjing Hospital of China Medical UniversityShenyang 110022LiaoningChina

Patients with heart failure(HF)often have a poor prognosis,with high morbidity and mortality.In the Chinese adult population,the prevalence of HF increased by 44%in the past 15 years,which was1.3%[1].HF is often assoc... 详细信息

关键词： Kidney Patients mortality

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Polar Phase Formation and Piezoelectricity of PVDF by Hot-pressing under Electrostatic Intermolecular Interactions

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Chinese Journal of Polymer Science 2022年第7期40卷 799-806页

作者： Jing-Hua Zhao Bao-Sheng He Ao-Shen Li Chao-Nan Wang qing-qing Li zhi-jun Hu Center for Soft Condensed Matter Physics and Interdisciplinary Research Soochow UniversitySuzhou215123China School of Optoelectronics Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow UniversitySuzhou215006China Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of China Soochow UniversitySuzhou215006China

Piezoelectric poly(vinylidene fluoride)(PVDF)has received considerable attention due to its ability of interconverting mechanical into electric energies and potential applications in wearable electronics.To achieve piezoelectricity,it is important to simultaneously control the formation of polar phases,crystallinity,and dipole alignments in PVDF-based films.Here we demonstrate that piezoelectricity can be obtained by directly hot-pressing PVDF films sandwiched between chitosan or cellulose films.The electrostatic interactions between PVDF and chitosan or cellulose enabled an exceptional high content of polar phases(β-andγ-phases)up to 90%and a measured piezoelectric charge coefficient d_(33)of up to-30 pC/N.This study provides a simple and low-cost approach for obtaining piezoelectric PVDF films used for sensors,actuators,and energy harvesters.

关键词： Poly(vinylidene fluoride) Piezoelectricity Electrostatic interactions Hot-pressing

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Microstructure evolution and performance improvement of powder metallurgy stainless steel with P addition

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Journal of Iron and Steel Research(International) 2023年第10期30卷 2055-2066页

作者： Qian Qin Dao-qing Zhang Fang Yang Cun-guang Chen jun-jie Hao zhi-meng Guo Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Shunde Innovation School University of Science and Technology BeijingGuangzhou 528399GuangdongChina

P-containing 316L stainless steel was prepared by powder metallurgy technology using gas atomized alloy powder and phosphorus-iron alloy powder as raw materials.P addition was beneficial to sintering densification.With 0.6 wt.%P addition,the density increased from 7.60 to 7.82 g/cm^(3).In such case,the samples with 0.6 wt.%P addition should be sintered at a lower temperature of 1200℃.Otherwise,there were coarse grain boundary precipitates,which would seriously deteriorate the performance of stainless steel.In the case of suppressing the formation of coarse precipitates,appropriate P content had a beneficial effect on apparent morphology,hardness and strength of stainless steel.When 316L-0.6 wt.%P sample was sintered at 1200℃,the hardness and tensile strength were increased to 86.3 HRB and 672.8 MPa,respectively,and the elongation still reached 38.1%.Besides,it also had good corrosion resistance.

关键词： Phosphorus Stainless steel Powder metallurgy Precipitate phase Performance

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Development of RF windows for 650 MHz multibeam klystron

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Nuclear Science and Techniques 2023年第9期34卷 58-68页

作者： Sheng-Chang Wang Zu-Sheng Zhou zhi-jun Lu zhi-qing Liu Shigeki Fukuda Yu Liu Jing-Yi Li Wei-Ming Li National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230026China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Kunshan Guo Li Electronic Technology Co. Ltd.Kunshan 215300China High Energy Accelerator Research Organization KEK 1-1 OhoTsukubaIbaraki 305-0801Japan

Radio frequency windows are developed and evaluated for a 650 MHz continuous-wave multibeam klystron.Thin-pillbox windows with alumina and beryllia disks are designed with an average RF power of CW 400 kW.Results of a cold test and tuning procedures are described.The final measured S11 curves under the required bandwidth are less than-32.0 and-26.9 dB for alumina and beryllia windows,respectively.The windows are tested up to CW 143 kW for traveling waves and CW 110 kW for standing waves using a solid-state amplifier as an RF power source.Multipactor simulations for windows and benchmark studies for the thermal analysis of ceramic disks are introduced.

关键词： RF window High-power test MBK

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